LP_ENABLE_KUBE_NAMESPACE set results in errors when no context available

[rsrchboy]

Shell, OS information:

error: current-context must exist in order to minify                                                                                                                                                  
[rsrchboy:~/.vim] [⎈] master(+76/-7,2)+* 20s ± echo $ZSH_VERSION 
5.8
error: current-context must exist in order to minify
[rsrchboy:~/.vim] [⎈] master(+76/-7,2)+* 127 ± uname -a      
Linux zeus 5.14.8-arch1-1 #1 SMP PREEMPT Sun, 26 Sep 2021 19:36:15 +0000 x86_64 GNU/Linux
error: current-context must exist in order to minify                                                                                                                                                                                                                                                                                         
[rsrchboy:~/.vim] [⎈] master(+76/-7,2)+* 1 ± cat /etc/os-release 
NAME="Arch Linux"
PRETTY_NAME="Arch Linux"
ID=arch
BUILD_ID=rolling
ANSI_COLOR="38;2;23;147;209"
HOME_URL="https://archlinux.org/"
DOCUMENTATION_URL="https://wiki.archlinux.org/"
SUPPORT_URL="https://bbs.archlinux.org/"
BUG_REPORT_URL="https://bugs.archlinux.org/"
LOGO=archlinux
error: current-context must exist in order to minify                                                                                                                                                  
[rsrchboy:~/.vim] [⎈] master(+76/-7,2)+* ± 

kubectl version:

Client Version: version.Info{Major:"1", Minor:"23", GitVersion:"v1.23.3", GitCommit:"816c97ab8cff8a1c72eccca1026f7820e93e0d25", GitTreeState:"archive", BuildDate:"2022-01-27T18:26:18Z", GoVersion:"go1.17.6", Compiler:"gc", Platform:"linux/amd64"}

Liquidprompt version: 9d27a43

Steps to Reproduce

1. Set LP_ENABLE_KUBECONTEXT=1 and LP_ENABLE_KUBE_NAMESPACE=1
2. Don't have any k8s contexts available; e.g. all minikube environments destroyed
3. Behold, leaked error messages from kubectl

Expected Behavior

As with other bits of liquidprompt, I'd expect the k8s portion of the prompt to simply not be present when no contexts are configured.

Current Behavior

error: current-context must exist in order to minify                                                                                                                                                  
[rsrchboy:~/.vim] [⎈] master(+76/-7,2)+* ± 

Note the error, and that the k8s section of the prompt is still present.

Possible Solution

It would be easy to mask the error message, e.g. add 2>/dev/null to the relevant command. However, this would still leave the part of the prompt present.

[Rycieos]

Can confirm, nice report.

I thought I had tested this when adding the namespace feature, but obviously not.

Easy fix by nulling stderr as suggested, and adding a return 1 if the command errors.